Check the listing for details. Goedrum 35mm Piezo with 1/4" 6.3mm Jack - Drum Trigger For Metal Shell. Condition: New. Listed at 6.99 USD. Goedrum DIY No.4 Note : ★ Any dimensions given are not measured with specialist equipment and are not guaranteed to be accurate in engineering terms. ★ We will combine shipping if you purchase multiple items. At the purchase of all your different items, click on the “Buy It Now” button. After that, click on commit to buy, and then, continue but don’t pay, please click “request an invoice” so we can adjust the invoice and apply a shipping discount for you. If you need any assistance, please contact us. Thank you! l This product comes exactly as shown in the pictures, and approximate dimensions are also as the photo. l This trigger can be installed under drumhead to transfer vibrations to most electronic drum sound modules. l Depends on your drum sound module, will be able to get a drumhead sound. l The 6.3mm stereo jack socket is with 7mm thread. l Piezo-element Specification: Type External drive type element Resonant Frequency 2.9 ± 0.5 KHz Resonant Impedance 300Ω max Capacitance 30000pF ± 30% at 100Hz Input Voltage 30Vp-p max Operating Temperature -20 to +60°C Storage Temperature -20 to +70°C Base Material Brass Return policy :Please contact us first if there is a mistake on your purchase. If a return is necessary, we can refund for the price paid minus shipping costs. Returned items must be in the same condition as you received them. Buyer pays for return shipping.